Sight glass applied in refrigeration system



FIG. 1 is a front view of a sight glass applied in refrigeration system comprising a new, original and ornamental design;

FIG. 2 is a left-hand side view of a sight glass applied in refrigeration system comprising the new, original and ornamental design, the right-hand side view being a mirror image thereof;

FIG. 3 is a top view of a sight glass applied in refrigeration system comprising the new, original and ornamental design;

FIG. 4 is a bottom view of a sight glass applied in refrigeration system comprising the new, original and ornamental design; and,

FIG. 5 is a perspective view of a sight glass applied in refrigeration system comprising the new, original and ornamental design. 

The ornamental design for a sight glass applied in refrigeration system, substantially as shown and described. 